Arithmetic Sequences Recursive Explicit

Which is an arithmetic sequence?

• 1, 3, 5, 7, 9, ...

• 1, 2, 4, 8, 16, 32, ...

• 1, 1, 2, 3, 5, 8, 13, ...

This is an arithmetic sequence. How many dots would be in the next figure?

• 4

• 13

• 14

• 15

Write the recursive formula for 6, 17, 28, 39, 50....

• a_n=a_n-1+11
  a₁=6

• a_n=a_n-1-4
  a₁=6

• a_n=a_n-1+9
  a₁=6

• a_n=a_n-1+6
  a₁=6

What is the 15th term of the sequence an = -3n+50

• 95

• -5

• 5

• -95

Given      t(n+1) = t(n) - 3 
and          t(1) = 6,
is this sequence also arithmetic or geometric or neither?

• arithmetic

• geometric

• neither

• Pick this one...if you like getting answers wrong

• 1

• 2

• 3

• 4

Identify the common difference.

• 4

• 3

• -4

• -3

Write a recursive formula for the following sequence:

10, 5, 0, -5,...

• a₁= 10

  a_n= a_n-1 - 5

• a₁= 10

  a_n= a_n-1 + 5

• a₁= 10

  a_n= a_n (5)

• a₁= 10

  a_n= a_n-1 (5)

Which of the following equations is recursive?

• f(n) = f(n-1) +4

• f(n) = 2n - 5

• 16

• 23

• 4

• 30